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An Analog Pre-emphasis Gradient Waveform Generator for Magnetic Resonance Imaging

Author: XieZhaoZuo
Tutor: LiZuoYing
School: East China Normal University
Course: Radio Physics
Keywords: NMR Magnetic resonance imaging Gradient Waveform Generator Analog pre-emphasis Digital potentiometer
CLC: TH89
Type: Master's thesis
Year: 2009
Downloads: 65
Quote: 2
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Abstract


Magnetic resonance imaging (MRI) is based on the high-tech performance characteristics of organisms magnetic nuclei ( protons ) in a magnetic field imaging , NMR applications . Today , magnetic resonance imaging has become one of the main tools for clinical diagnosis and basic subjects research . Gradient pulse unit is one of the core components of the MRI system , it not only from the scan speed , spatial resolution limit with the the entire MRI system performance improvement . In this paper, the spectrometer system with analog pre-emphasis function of the gradient waveform generator design , as well as the board described in the summary and outlook in the NMR experiments . The main content of the paper is as follows: The first part introduces the basic principles of magnetic resonance imaging . The basic principle and the basic principle of the magnetic resonance imaging , including magnetic resonance and , in addition, also describes some of the conventional magnetic resonance imaging used in sequence . The second part introduces the basic structure of the magnetic resonance imaging spectrometer . Including a magnet subsystem gradient subsystems , RF subsystem , signal acquisition subsystem , computer subsystem . The third part introduces the analog preemphasis gradient generator design . First introduced the original gradient waveform generator has shortcomings, and then the gradient waveform generator of the present design of the main structure and function are described and discussed . This article analog pre-emphasis function is to take advantage of the pre-emphasis circuit and digital logic control potentiometer combined to complete it to overcome the heavy workload of the traditional analog pre-emphasis , repeatability defects and poor , as well as digital pre-emphasis the delay . The fourth part of this article gradient generator performance testing , imager , system integration, and eddy current compensation experiments and imaging experiments .

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